package collection;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ListDemo {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("one");
        list.add("two");
        list.add("three");
        list.add("four");
        list.add("five");
        System.out.println("list:"+list);
        String e = list.get(3);
        System.out.println(e);
        for (int i=0;i<list.size();i++){
            System.out.println(list.get(i));
        }
        Iterator<String> it = list.iterator();
        while (it.hasNext()){
            System.out.println(it.next());
        }
        for (String s :list){
            System.out.println(s);
        }
        System.out.println("---------------");
        String old = list.set(2,"six");
        System.out.println("list:"+list);
        System.out.println(old);

        String s = list.remove(2);
        System.out.println("list:"+list);
        System.out.println(s);

        /*
        void add(int index,E e):
        将给定元素e添加到index所指定的位置，相当于插入操作
         */
        list.add(3,"seven");
        System.out.println(list);
    }
}
